ext4_utils.h revision e8d74ff5c3253403d3e5c96edc80dfc3e5f8ada8
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef _EXT4_UTILS_H_ 18#define _EXT4_UTILS_H_ 19 20#ifdef __cplusplus 21extern "C" { 22#endif 23 24#ifndef _GNU_SOURCE 25#define _GNU_SOURCE 26#endif 27#define _FILE_OFFSET_BITS 64 28#define _LARGEFILE64_SOURCE 29#include <sys/types.h> 30#include <unistd.h> 31 32#include <sys/types.h> 33#include <errno.h> 34#include <stdarg.h> 35#include <stdio.h> 36#include <stdlib.h> 37#include <string.h> 38#include <setjmp.h> 39 40#if defined(__APPLE__) && defined(__MACH__) 41#define lseek64 lseek 42#define ftruncate64 ftruncate 43#define mmap64 mmap 44#define off64_t off_t 45#endif 46 47#ifdef __BIONIC__ 48extern void* __mmap2(void *, size_t, int, int, int, off_t); 49static inline void *mmap64(void *addr, size_t length, int prot, int flags, 50 int fd, off64_t offset) 51{ 52 return __mmap2(addr, length, prot, flags, fd, offset >> 12); 53} 54#endif 55 56extern int force; 57 58#define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0) 59#define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) longjmp(setjmp_env, EXIT_FAILURE); } while (0) 60#define error_errno(s, args...) error(s ": %s", ##args, strerror(errno)) 61#define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); longjmp(setjmp_env, EXIT_FAILURE); } while (0) 62#define critical_error_errno(s, args...) critical_error(s ": %s", ##args, strerror(errno)) 63 64#define EXT4_SUPER_MAGIC 0xEF53 65#define EXT4_JNL_BACKUP_BLOCKS 1 66 67#define min(a, b) ((a) < (b) ? (a) : (b)) 68 69#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y)) 70#define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y))) 71 72#define __le64 u64 73#define __le32 u32 74#define __le16 u16 75 76#define __be64 u64 77#define __be32 u32 78#define __be16 u16 79 80#define __u64 u64 81#define __u32 u32 82#define __u16 u16 83#define __u8 u8 84 85typedef unsigned long long u64; 86typedef signed long long s64; 87typedef unsigned int u32; 88typedef unsigned short int u16; 89typedef unsigned char u8; 90 91struct block_group_info; 92 93struct ext2_group_desc { 94 __le32 bg_block_bitmap; 95 __le32 bg_inode_bitmap; 96 __le32 bg_inode_table; 97 __le16 bg_free_blocks_count; 98 __le16 bg_free_inodes_count; 99 __le16 bg_used_dirs_count; 100 __le16 bg_pad; 101 __le32 bg_reserved[3]; 102}; 103 104struct fs_info { 105 s64 len; /* If set to 0, ask the block device for the size, 106 * if less than 0, reserve that much space at the 107 * end of the partition, else use the size given. */ 108 u32 block_size; 109 u32 blocks_per_group; 110 u32 inodes_per_group; 111 u32 inode_size; 112 u32 inodes; 113 u32 journal_blocks; 114 u16 feat_ro_compat; 115 u16 feat_compat; 116 u16 feat_incompat; 117 u32 bg_desc_reserve_blocks; 118 const char *label; 119 u8 no_journal; 120}; 121 122struct fs_aux_info { 123 struct ext4_super_block *sb; 124 struct ext4_super_block **backup_sb; 125 struct ext2_group_desc *bg_desc; 126 struct block_group_info *bgs; 127 u32 first_data_block; 128 u64 len_blocks; 129 u32 inode_table_blocks; 130 u32 groups; 131 u32 bg_desc_blocks; 132 u32 default_i_flags; 133 u32 blocks_per_ind; 134 u32 blocks_per_dind; 135 u32 blocks_per_tind; 136}; 137 138extern struct fs_info info; 139extern struct fs_aux_info aux_info; 140 141extern jmp_buf setjmp_env; 142 143static inline int log_2(int j) 144{ 145 int i; 146 147 for (i = 0; j > 0; i++) 148 j >>= 1; 149 150 return i - 1; 151} 152 153int ext4_bg_has_super_block(int bg); 154void write_ext4_image(const char *filename, int gz, int sparse, int crc, 155 int wipe); 156void ext4_create_fs_aux_info(void); 157void ext4_free_fs_aux_info(void); 158void ext4_fill_in_sb(void); 159void ext4_create_resize_inode(void); 160void ext4_create_journal_inode(void); 161void ext4_update_free(void); 162void ext4_queue_sb(void); 163u64 get_file_size(const char *filename); 164u64 parse_num(const char *arg); 165void ext4_parse_sb(struct ext4_super_block *sb); 166 167#ifdef __cplusplus 168} 169#endif 170 171#endif 172